Compared to polymer lithium batteries 18650.

Compared to polymer lithium batteries 18650.

The international price of 18650 is approximately 1USD/pcs, calculated at 2Ah, which is about 3RMB/Ah. Compared with the price of polymer lithium batteries, counterfeit factories in the mid to low end range are priced at 4 RMB/Ah, mid-range range range at 5~7 RMB/Ah, and high-end range above 7 RMB/Ah. Products like ATL and Lishen can generally be sold for around 10 RMB/Ah, but when your order becomes smaller, others are still unwilling to accept it.

2、 Cannot be customized.
SONY has always been looking forward to making lithium batteries into dry batteries, and there are some national standards, such as the No. 5 battery and No. 7 battery. The vast majority of rechargeable batteries in the world are like this. However, due to one of the major advantages of lithium batteries being the ability to design according to customer needs, there is unlikely to be a unified standard. Therefore, so far, the vast majority of products in the lithium battery field only have the 18650 standard model specification, and the rest are designed according to customer specifications.

3、 Poor safety

Under extreme standards (such as charging, high temperature, etc.), lithium batteries will undergo strong chemical changes inside, resulting in a lot of vapor. The plastic shell used for rechargeable batteries has a certain compressive strength. When the standard air pressure inside the rechargeable battery reaches a certain level, the aluminum shell of the rechargeable battery will crack and explode, causing a very terrifying production safety accident.

Therefore, rooms for inspecting 18650 rechargeable batteries generally require layer by layer protective measures, and entry is definitely prohibited throughout the entire inspection process. This problem does not exist, even in extreme situations, because the compressive strength of the packaging film is low, it only needs a slightly higher gas working pressure to crack, which is not easy to cause explosions, and the worst case is ignition. Therefore, polymer lithium batteries have better safety factors than 18650 rechargeable batteries.

4、 Low energy density
The capacity of a typical 18650 rechargeable battery can reach 2200mAh, so the calculated specific energy is approximately 500Wh/L. Currently, the specific energy of polymer lithium batteries can reach 600Wh/L.